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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />~ <br /> <br />Alternative 2 - Reduce Dam Heil!ht. For this alternative the dam height will be reduced <br />approximately 10 feet and the dam rehabilitated to meet the current requirements of the State <br />Engineer. This alternative consists of filling the temporary breach in the dam, reducing the crest <br />elevation to 8242 feet, reshaping and flattening the downstream slope to 2.5 to 1, placing riprap <br />slope protection on a portion of the upstream face, constructing a toe drain at the downstream toe, <br />insta.lling a new 18-inch diameter outlet conduit, and constructing a 100-foot wide spillway with <br />a concrete cutoff wall. The spillway will be placed at elevation 8237 feet which allows for 5 feet <br />of freeboard. <br /> <br />. <br />Figure 2 shows the cross section of this alternative and the details of the work proposed. <br /> <br />Alternative 3 - Maintain Existing Dam Hei~ht. This alternative consists of rehabilitating the dam <br />to maintain the existing storage height, For this alternative the dam crest will be re-graded and <br />re-shaped, the temporary breach will be filled, the downstream slope will be flattened to 2.5 to <br />1 by placing fill on the downstream slope, placing riprap slope protection on a portion of the <br />upstream face, constructing a toe drain and drainage blanket near the downstream toe, installing <br />a new 18-inch diameter outlet conduit, and constructing a 50-foot wide spillway with a concrete <br />cutoff wall. The spillway will be placed at elevation 8247 feet which allows for 5 feet of <br />freeboard. <br /> <br />Figure 3 shows the cross section of this alternative and the details of the work proposed. <br /> <br />Alternative 4 - Increase Dam Height. This alternative consists of rehabilitating the dam to the an <br />elevation approximately 12 feet higher than the existing dam crest. For this alternative the dam <br />height will be raised and rehabilitated to meet the current requirements of the State Engineer. This <br />alternative consists of filling the temporary breach in the dam, increasing the crest elevation to <br />8267 feet by placing fill on the upstream and downstream faces at a 3 to 1 slope, placing riprap <br />slope protection on a portion of the upstream face, constructing a toe drain and drainage blanket <br />near the downstream toe, installing a new 18-inch diameter outlet conduit, and constructing a 50- <br />foot wide spillway with a concrete cutoff wall. The spillway will be placed at elevation 8262 feet <br />which allows for 5 feet of freeboard. <br /> <br />Figure 3 shows the cross section of this alternative and the details of the work proposed. <br /> <br />Carl Smith Dam Feasibility <br /> <br />Page 8 <br /> <br />4 <br />